COURTLAND TOWNSHIP (WWJ) — Police in western Michigan are searching for a driver who fled a crash that killed a woman and critically injured her twin 5-year-old sons.

The Grand Rapids Press reports the crash happened just before 8:30 p.m. on Friday at a rural intersection in Courtland Township, northeast of Grand Rapids. The Kent County sheriff’s office says the driver of a Ford F-150 pickup blew through a stop sign, striking the woman’s vehicle and killing Meranda Baguss, 33.

Her children were taken to a hospital with life-threatening injuries.

Police used a helicopter and tracking dogs, but have not found the driver, who reportedly fled on foot.